| 1 | /* Motorola 68HC11-specific support for 32-bit ELF |
| 2 | Copyright 1999, 2000, 2001, 2002, 2003, 2004 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Stephane Carrez (stcarrez@nerim.fr) |
| 5 | (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "bfd.h" |
| 24 | #include "sysdep.h" |
| 25 | #include "bfdlink.h" |
| 26 | #include "libbfd.h" |
| 27 | #include "elf-bfd.h" |
| 28 | #include "elf32-m68hc1x.h" |
| 29 | #include "elf/m68hc11.h" |
| 30 | #include "opcode/m68hc11.h" |
| 31 | |
| 32 | /* Relocation functions. */ |
| 33 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 34 | (bfd *, bfd_reloc_code_real_type); |
| 35 | static void m68hc11_info_to_howto_rel |
| 36 | (bfd *, arelent *, Elf_Internal_Rela *); |
| 37 | |
| 38 | /* Trampoline generation. */ |
| 39 | static bfd_boolean m68hc11_elf_size_one_stub |
| 40 | (struct bfd_hash_entry *gen_entry, void *in_arg); |
| 41 | static bfd_boolean m68hc11_elf_build_one_stub |
| 42 | (struct bfd_hash_entry *gen_entry, void *in_arg); |
| 43 | static struct bfd_link_hash_table* m68hc11_elf_bfd_link_hash_table_create |
| 44 | (bfd* abfd); |
| 45 | |
| 46 | /* Linker relaxation. */ |
| 47 | static bfd_boolean m68hc11_elf_relax_section |
| 48 | (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); |
| 49 | static void m68hc11_elf_relax_delete_bytes |
| 50 | (bfd *, asection *, bfd_vma, int); |
| 51 | static void m68hc11_relax_group |
| 52 | (bfd *, asection *, bfd_byte *, unsigned, unsigned long, unsigned long); |
| 53 | static int compare_reloc (const void *, const void *); |
| 54 | |
| 55 | /* Use REL instead of RELA to save space */ |
| 56 | #define USE_REL 1 |
| 57 | |
| 58 | /* The Motorola 68HC11 microcontroller only addresses 64Kb but we also |
| 59 | support a memory bank switching mechanism similar to 68HC12. |
| 60 | We must handle 8 and 16-bit relocations. The 32-bit relocation |
| 61 | are used for debugging sections (DWARF2) to represent a virtual |
| 62 | address. |
| 63 | The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ |
| 64 | static reloc_howto_type elf_m68hc11_howto_table[] = { |
| 65 | /* This reloc does nothing. */ |
| 66 | HOWTO (R_M68HC11_NONE, /* type */ |
| 67 | 0, /* rightshift */ |
| 68 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 69 | 32, /* bitsize */ |
| 70 | FALSE, /* pc_relative */ |
| 71 | 0, /* bitpos */ |
| 72 | complain_overflow_dont,/* complain_on_overflow */ |
| 73 | bfd_elf_generic_reloc, /* special_function */ |
| 74 | "R_M68HC11_NONE", /* name */ |
| 75 | FALSE, /* partial_inplace */ |
| 76 | 0, /* src_mask */ |
| 77 | 0, /* dst_mask */ |
| 78 | FALSE), /* pcrel_offset */ |
| 79 | |
| 80 | /* A 8 bit absolute relocation */ |
| 81 | HOWTO (R_M68HC11_8, /* type */ |
| 82 | 0, /* rightshift */ |
| 83 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 84 | 8, /* bitsize */ |
| 85 | FALSE, /* pc_relative */ |
| 86 | 0, /* bitpos */ |
| 87 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 88 | bfd_elf_generic_reloc, /* special_function */ |
| 89 | "R_M68HC11_8", /* name */ |
| 90 | FALSE, /* partial_inplace */ |
| 91 | 0x00ff, /* src_mask */ |
| 92 | 0x00ff, /* dst_mask */ |
| 93 | FALSE), /* pcrel_offset */ |
| 94 | |
| 95 | /* A 8 bit absolute relocation (upper address) */ |
| 96 | HOWTO (R_M68HC11_HI8, /* type */ |
| 97 | 8, /* rightshift */ |
| 98 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 99 | 8, /* bitsize */ |
| 100 | FALSE, /* pc_relative */ |
| 101 | 0, /* bitpos */ |
| 102 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 103 | bfd_elf_generic_reloc, /* special_function */ |
| 104 | "R_M68HC11_HI8", /* name */ |
| 105 | FALSE, /* partial_inplace */ |
| 106 | 0x00ff, /* src_mask */ |
| 107 | 0x00ff, /* dst_mask */ |
| 108 | FALSE), /* pcrel_offset */ |
| 109 | |
| 110 | /* A 8 bit absolute relocation (upper address) */ |
| 111 | HOWTO (R_M68HC11_LO8, /* type */ |
| 112 | 0, /* rightshift */ |
| 113 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 114 | 8, /* bitsize */ |
| 115 | FALSE, /* pc_relative */ |
| 116 | 0, /* bitpos */ |
| 117 | complain_overflow_dont, /* complain_on_overflow */ |
| 118 | bfd_elf_generic_reloc, /* special_function */ |
| 119 | "R_M68HC11_LO8", /* name */ |
| 120 | FALSE, /* partial_inplace */ |
| 121 | 0x00ff, /* src_mask */ |
| 122 | 0x00ff, /* dst_mask */ |
| 123 | FALSE), /* pcrel_offset */ |
| 124 | |
| 125 | /* A 8 bit PC-rel relocation */ |
| 126 | HOWTO (R_M68HC11_PCREL_8, /* type */ |
| 127 | 0, /* rightshift */ |
| 128 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 129 | 8, /* bitsize */ |
| 130 | TRUE, /* pc_relative */ |
| 131 | 0, /* bitpos */ |
| 132 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 133 | bfd_elf_generic_reloc, /* special_function */ |
| 134 | "R_M68HC11_PCREL_8", /* name */ |
| 135 | FALSE, /* partial_inplace */ |
| 136 | 0x00ff, /* src_mask */ |
| 137 | 0x00ff, /* dst_mask */ |
| 138 | TRUE), /* pcrel_offset */ |
| 139 | |
| 140 | /* A 16 bit absolute relocation */ |
| 141 | HOWTO (R_M68HC11_16, /* type */ |
| 142 | 0, /* rightshift */ |
| 143 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 144 | 16, /* bitsize */ |
| 145 | FALSE, /* pc_relative */ |
| 146 | 0, /* bitpos */ |
| 147 | complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ |
| 148 | bfd_elf_generic_reloc, /* special_function */ |
| 149 | "R_M68HC11_16", /* name */ |
| 150 | FALSE, /* partial_inplace */ |
| 151 | 0xffff, /* src_mask */ |
| 152 | 0xffff, /* dst_mask */ |
| 153 | FALSE), /* pcrel_offset */ |
| 154 | |
| 155 | /* A 32 bit absolute relocation. This one is never used for the |
| 156 | code relocation. It's used by gas for -gstabs generation. */ |
| 157 | HOWTO (R_M68HC11_32, /* type */ |
| 158 | 0, /* rightshift */ |
| 159 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 160 | 32, /* bitsize */ |
| 161 | FALSE, /* pc_relative */ |
| 162 | 0, /* bitpos */ |
| 163 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 164 | bfd_elf_generic_reloc, /* special_function */ |
| 165 | "R_M68HC11_32", /* name */ |
| 166 | FALSE, /* partial_inplace */ |
| 167 | 0xffffffff, /* src_mask */ |
| 168 | 0xffffffff, /* dst_mask */ |
| 169 | FALSE), /* pcrel_offset */ |
| 170 | |
| 171 | /* A 3 bit absolute relocation */ |
| 172 | HOWTO (R_M68HC11_3B, /* type */ |
| 173 | 0, /* rightshift */ |
| 174 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 175 | 3, /* bitsize */ |
| 176 | FALSE, /* pc_relative */ |
| 177 | 0, /* bitpos */ |
| 178 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 179 | bfd_elf_generic_reloc, /* special_function */ |
| 180 | "R_M68HC11_4B", /* name */ |
| 181 | FALSE, /* partial_inplace */ |
| 182 | 0x003, /* src_mask */ |
| 183 | 0x003, /* dst_mask */ |
| 184 | FALSE), /* pcrel_offset */ |
| 185 | |
| 186 | /* A 16 bit PC-rel relocation */ |
| 187 | HOWTO (R_M68HC11_PCREL_16, /* type */ |
| 188 | 0, /* rightshift */ |
| 189 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 190 | 16, /* bitsize */ |
| 191 | TRUE, /* pc_relative */ |
| 192 | 0, /* bitpos */ |
| 193 | complain_overflow_dont, /* complain_on_overflow */ |
| 194 | bfd_elf_generic_reloc, /* special_function */ |
| 195 | "R_M68HC11_PCREL_16", /* name */ |
| 196 | FALSE, /* partial_inplace */ |
| 197 | 0xffff, /* src_mask */ |
| 198 | 0xffff, /* dst_mask */ |
| 199 | TRUE), /* pcrel_offset */ |
| 200 | |
| 201 | /* GNU extension to record C++ vtable hierarchy */ |
| 202 | HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ |
| 203 | 0, /* rightshift */ |
| 204 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 205 | 0, /* bitsize */ |
| 206 | FALSE, /* pc_relative */ |
| 207 | 0, /* bitpos */ |
| 208 | complain_overflow_dont, /* complain_on_overflow */ |
| 209 | NULL, /* special_function */ |
| 210 | "R_M68HC11_GNU_VTINHERIT", /* name */ |
| 211 | FALSE, /* partial_inplace */ |
| 212 | 0, /* src_mask */ |
| 213 | 0, /* dst_mask */ |
| 214 | FALSE), /* pcrel_offset */ |
| 215 | |
| 216 | /* GNU extension to record C++ vtable member usage */ |
| 217 | HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ |
| 218 | 0, /* rightshift */ |
| 219 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 220 | 0, /* bitsize */ |
| 221 | FALSE, /* pc_relative */ |
| 222 | 0, /* bitpos */ |
| 223 | complain_overflow_dont, /* complain_on_overflow */ |
| 224 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 225 | "R_M68HC11_GNU_VTENTRY", /* name */ |
| 226 | FALSE, /* partial_inplace */ |
| 227 | 0, /* src_mask */ |
| 228 | 0, /* dst_mask */ |
| 229 | FALSE), /* pcrel_offset */ |
| 230 | |
| 231 | /* A 24 bit relocation */ |
| 232 | HOWTO (R_M68HC11_24, /* type */ |
| 233 | 0, /* rightshift */ |
| 234 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 235 | 24, /* bitsize */ |
| 236 | FALSE, /* pc_relative */ |
| 237 | 0, /* bitpos */ |
| 238 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 239 | bfd_elf_generic_reloc, /* special_function */ |
| 240 | "R_M68HC11_24", /* name */ |
| 241 | FALSE, /* partial_inplace */ |
| 242 | 0xffffff, /* src_mask */ |
| 243 | 0xffffff, /* dst_mask */ |
| 244 | FALSE), /* pcrel_offset */ |
| 245 | |
| 246 | /* A 16-bit low relocation */ |
| 247 | HOWTO (R_M68HC11_LO16, /* type */ |
| 248 | 0, /* rightshift */ |
| 249 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 250 | 16, /* bitsize */ |
| 251 | FALSE, /* pc_relative */ |
| 252 | 0, /* bitpos */ |
| 253 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 254 | bfd_elf_generic_reloc, /* special_function */ |
| 255 | "R_M68HC11_LO16", /* name */ |
| 256 | FALSE, /* partial_inplace */ |
| 257 | 0xffff, /* src_mask */ |
| 258 | 0xffff, /* dst_mask */ |
| 259 | FALSE), /* pcrel_offset */ |
| 260 | |
| 261 | /* A page relocation */ |
| 262 | HOWTO (R_M68HC11_PAGE, /* type */ |
| 263 | 0, /* rightshift */ |
| 264 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 265 | 8, /* bitsize */ |
| 266 | FALSE, /* pc_relative */ |
| 267 | 0, /* bitpos */ |
| 268 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 269 | bfd_elf_generic_reloc, /* special_function */ |
| 270 | "R_M68HC11_PAGE", /* name */ |
| 271 | FALSE, /* partial_inplace */ |
| 272 | 0x00ff, /* src_mask */ |
| 273 | 0x00ff, /* dst_mask */ |
| 274 | FALSE), /* pcrel_offset */ |
| 275 | |
| 276 | EMPTY_HOWTO (14), |
| 277 | EMPTY_HOWTO (15), |
| 278 | EMPTY_HOWTO (16), |
| 279 | EMPTY_HOWTO (17), |
| 280 | EMPTY_HOWTO (18), |
| 281 | EMPTY_HOWTO (19), |
| 282 | |
| 283 | /* Mark beginning of a jump instruction (any form). */ |
| 284 | HOWTO (R_M68HC11_RL_JUMP, /* type */ |
| 285 | 0, /* rightshift */ |
| 286 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 287 | 0, /* bitsize */ |
| 288 | FALSE, /* pc_relative */ |
| 289 | 0, /* bitpos */ |
| 290 | complain_overflow_dont, /* complain_on_overflow */ |
| 291 | m68hc11_elf_ignore_reloc, /* special_function */ |
| 292 | "R_M68HC11_RL_JUMP", /* name */ |
| 293 | TRUE, /* partial_inplace */ |
| 294 | 0, /* src_mask */ |
| 295 | 0, /* dst_mask */ |
| 296 | TRUE), /* pcrel_offset */ |
| 297 | |
| 298 | /* Mark beginning of Gcc relaxation group instruction. */ |
| 299 | HOWTO (R_M68HC11_RL_GROUP, /* type */ |
| 300 | 0, /* rightshift */ |
| 301 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 302 | 0, /* bitsize */ |
| 303 | FALSE, /* pc_relative */ |
| 304 | 0, /* bitpos */ |
| 305 | complain_overflow_dont, /* complain_on_overflow */ |
| 306 | m68hc11_elf_ignore_reloc, /* special_function */ |
| 307 | "R_M68HC11_RL_GROUP", /* name */ |
| 308 | TRUE, /* partial_inplace */ |
| 309 | 0, /* src_mask */ |
| 310 | 0, /* dst_mask */ |
| 311 | TRUE), /* pcrel_offset */ |
| 312 | }; |
| 313 | |
| 314 | /* Map BFD reloc types to M68HC11 ELF reloc types. */ |
| 315 | |
| 316 | struct m68hc11_reloc_map |
| 317 | { |
| 318 | bfd_reloc_code_real_type bfd_reloc_val; |
| 319 | unsigned char elf_reloc_val; |
| 320 | }; |
| 321 | |
| 322 | static const struct m68hc11_reloc_map m68hc11_reloc_map[] = { |
| 323 | {BFD_RELOC_NONE, R_M68HC11_NONE,}, |
| 324 | {BFD_RELOC_8, R_M68HC11_8}, |
| 325 | {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8}, |
| 326 | {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8}, |
| 327 | {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8}, |
| 328 | {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16}, |
| 329 | {BFD_RELOC_16, R_M68HC11_16}, |
| 330 | {BFD_RELOC_32, R_M68HC11_32}, |
| 331 | {BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, |
| 332 | |
| 333 | {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, |
| 334 | {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, |
| 335 | |
| 336 | {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16}, |
| 337 | {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE}, |
| 338 | {BFD_RELOC_M68HC11_24, R_M68HC11_24}, |
| 339 | |
| 340 | {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP}, |
| 341 | {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP}, |
| 342 | }; |
| 343 | |
| 344 | static reloc_howto_type * |
| 345 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 346 | bfd_reloc_code_real_type code) |
| 347 | { |
| 348 | unsigned int i; |
| 349 | |
| 350 | for (i = 0; |
| 351 | i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map); |
| 352 | i++) |
| 353 | { |
| 354 | if (m68hc11_reloc_map[i].bfd_reloc_val == code) |
| 355 | return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val]; |
| 356 | } |
| 357 | |
| 358 | return NULL; |
| 359 | } |
| 360 | |
| 361 | /* Set the howto pointer for an M68HC11 ELF reloc. */ |
| 362 | |
| 363 | static void |
| 364 | m68hc11_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| 365 | arelent *cache_ptr, Elf_Internal_Rela *dst) |
| 366 | { |
| 367 | unsigned int r_type; |
| 368 | |
| 369 | r_type = ELF32_R_TYPE (dst->r_info); |
| 370 | BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max); |
| 371 | cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; |
| 372 | } |
| 373 | |
| 374 | \f |
| 375 | /* Far trampoline generation. */ |
| 376 | |
| 377 | /* Build a 68HC11 trampoline stub. */ |
| 378 | static bfd_boolean |
| 379 | m68hc11_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) |
| 380 | { |
| 381 | struct elf32_m68hc11_stub_hash_entry *stub_entry; |
| 382 | struct bfd_link_info *info; |
| 383 | struct m68hc11_elf_link_hash_table *htab; |
| 384 | asection *stub_sec; |
| 385 | bfd *stub_bfd; |
| 386 | bfd_byte *loc; |
| 387 | bfd_vma sym_value, phys_page, phys_addr; |
| 388 | |
| 389 | /* Massage our args to the form they really have. */ |
| 390 | stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
| 391 | info = (struct bfd_link_info *) in_arg; |
| 392 | |
| 393 | htab = m68hc11_elf_hash_table (info); |
| 394 | |
| 395 | stub_sec = stub_entry->stub_sec; |
| 396 | |
| 397 | /* Make a note of the offset within the stubs for this entry. */ |
| 398 | stub_entry->stub_offset = stub_sec->size; |
| 399 | stub_sec->size += 10; |
| 400 | loc = stub_sec->contents + stub_entry->stub_offset; |
| 401 | |
| 402 | stub_bfd = stub_sec->owner; |
| 403 | |
| 404 | /* Create the trampoline call stub: |
| 405 | |
| 406 | pshb |
| 407 | ldab #%page(symbol) |
| 408 | ldy #%addr(symbol) |
| 409 | jmp __trampoline |
| 410 | |
| 411 | */ |
| 412 | sym_value = (stub_entry->target_value |
| 413 | + stub_entry->target_section->output_offset |
| 414 | + stub_entry->target_section->output_section->vma); |
| 415 | phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value); |
| 416 | phys_page = m68hc11_phys_page (&htab->pinfo, sym_value); |
| 417 | |
| 418 | /* pshb; ldab #%page(sym) */ |
| 419 | bfd_put_8 (stub_bfd, 0x37, loc); |
| 420 | bfd_put_8 (stub_bfd, 0xC6, loc + 1); |
| 421 | bfd_put_8 (stub_bfd, phys_page, loc + 2); |
| 422 | loc += 3; |
| 423 | |
| 424 | /* ldy #%addr(sym) */ |
| 425 | bfd_put_8 (stub_bfd, 0x18, loc); |
| 426 | bfd_put_8 (stub_bfd, 0xCE, loc + 1); |
| 427 | bfd_put_16 (stub_bfd, phys_addr, loc + 2); |
| 428 | loc += 4; |
| 429 | |
| 430 | /* jmp __trampoline */ |
| 431 | bfd_put_8 (stub_bfd, 0x7E, loc); |
| 432 | bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1); |
| 433 | |
| 434 | return TRUE; |
| 435 | } |
| 436 | |
| 437 | /* As above, but don't actually build the stub. Just bump offset so |
| 438 | we know stub section sizes. */ |
| 439 | |
| 440 | static bfd_boolean |
| 441 | m68hc11_elf_size_one_stub (struct bfd_hash_entry *gen_entry, |
| 442 | void *in_arg ATTRIBUTE_UNUSED) |
| 443 | { |
| 444 | struct elf32_m68hc11_stub_hash_entry *stub_entry; |
| 445 | |
| 446 | /* Massage our args to the form they really have. */ |
| 447 | stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
| 448 | |
| 449 | stub_entry->stub_sec->size += 10; |
| 450 | return TRUE; |
| 451 | } |
| 452 | |
| 453 | /* Create a 68HC11 ELF linker hash table. */ |
| 454 | |
| 455 | static struct bfd_link_hash_table * |
| 456 | m68hc11_elf_bfd_link_hash_table_create (bfd *abfd) |
| 457 | { |
| 458 | struct m68hc11_elf_link_hash_table *ret; |
| 459 | |
| 460 | ret = m68hc11_elf_hash_table_create (abfd); |
| 461 | if (ret == (struct m68hc11_elf_link_hash_table *) NULL) |
| 462 | return NULL; |
| 463 | |
| 464 | ret->size_one_stub = m68hc11_elf_size_one_stub; |
| 465 | ret->build_one_stub = m68hc11_elf_build_one_stub; |
| 466 | |
| 467 | return &ret->root.root; |
| 468 | } |
| 469 | |
| 470 | \f |
| 471 | /* 68HC11 Linker Relaxation. */ |
| 472 | |
| 473 | struct m68hc11_direct_relax |
| 474 | { |
| 475 | const char *name; |
| 476 | unsigned char code; |
| 477 | unsigned char direct_code; |
| 478 | } m68hc11_direct_relax_table[] = { |
| 479 | { "adca", 0xB9, 0x99 }, |
| 480 | { "adcb", 0xF9, 0xD9 }, |
| 481 | { "adda", 0xBB, 0x9B }, |
| 482 | { "addb", 0xFB, 0xDB }, |
| 483 | { "addd", 0xF3, 0xD3 }, |
| 484 | { "anda", 0xB4, 0x94 }, |
| 485 | { "andb", 0xF4, 0xD4 }, |
| 486 | { "cmpa", 0xB1, 0x91 }, |
| 487 | { "cmpb", 0xF1, 0xD1 }, |
| 488 | { "cpd", 0xB3, 0x93 }, |
| 489 | { "cpxy", 0xBC, 0x9C }, |
| 490 | /* { "cpy", 0xBC, 0x9C }, */ |
| 491 | { "eora", 0xB8, 0x98 }, |
| 492 | { "eorb", 0xF8, 0xD8 }, |
| 493 | { "jsr", 0xBD, 0x9D }, |
| 494 | { "ldaa", 0xB6, 0x96 }, |
| 495 | { "ldab", 0xF6, 0xD6 }, |
| 496 | { "ldd", 0xFC, 0xDC }, |
| 497 | { "lds", 0xBE, 0x9E }, |
| 498 | { "ldxy", 0xFE, 0xDE }, |
| 499 | /* { "ldy", 0xFE, 0xDE },*/ |
| 500 | { "oraa", 0xBA, 0x9A }, |
| 501 | { "orab", 0xFA, 0xDA }, |
| 502 | { "sbca", 0xB2, 0x92 }, |
| 503 | { "sbcb", 0xF2, 0xD2 }, |
| 504 | { "staa", 0xB7, 0x97 }, |
| 505 | { "stab", 0xF7, 0xD7 }, |
| 506 | { "std", 0xFD, 0xDD }, |
| 507 | { "sts", 0xBF, 0x9F }, |
| 508 | { "stxy", 0xFF, 0xDF }, |
| 509 | /* { "sty", 0xFF, 0xDF },*/ |
| 510 | { "suba", 0xB0, 0x90 }, |
| 511 | { "subb", 0xF0, 0xD0 }, |
| 512 | { "subd", 0xB3, 0x93 }, |
| 513 | { 0, 0, 0 } |
| 514 | }; |
| 515 | |
| 516 | static struct m68hc11_direct_relax * |
| 517 | find_relaxable_insn (unsigned char code) |
| 518 | { |
| 519 | int i; |
| 520 | |
| 521 | for (i = 0; m68hc11_direct_relax_table[i].name; i++) |
| 522 | if (m68hc11_direct_relax_table[i].code == code) |
| 523 | return &m68hc11_direct_relax_table[i]; |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | static int |
| 529 | compare_reloc (const void *e1, const void *e2) |
| 530 | { |
| 531 | const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1; |
| 532 | const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2; |
| 533 | |
| 534 | if (i1->r_offset == i2->r_offset) |
| 535 | return 0; |
| 536 | else |
| 537 | return i1->r_offset < i2->r_offset ? -1 : 1; |
| 538 | } |
| 539 | |
| 540 | #define M6811_OP_LDX_IMMEDIATE (0xCE) |
| 541 | |
| 542 | static void |
| 543 | m68hc11_relax_group (bfd *abfd, asection *sec, bfd_byte *contents, |
| 544 | unsigned value, unsigned long offset, |
| 545 | unsigned long end_group) |
| 546 | { |
| 547 | unsigned char code; |
| 548 | unsigned long start_offset; |
| 549 | unsigned long ldx_offset = offset; |
| 550 | unsigned long ldx_size; |
| 551 | int can_delete_ldx; |
| 552 | int relax_ldy = 0; |
| 553 | |
| 554 | /* First instruction of the relax group must be a |
| 555 | LDX #value or LDY #value. If this is not the case, |
| 556 | ignore the relax group. */ |
| 557 | code = bfd_get_8 (abfd, contents + offset); |
| 558 | if (code == 0x18) |
| 559 | { |
| 560 | relax_ldy++; |
| 561 | offset++; |
| 562 | code = bfd_get_8 (abfd, contents + offset); |
| 563 | } |
| 564 | ldx_size = offset - ldx_offset + 3; |
| 565 | offset += 3; |
| 566 | if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group) |
| 567 | return; |
| 568 | |
| 569 | |
| 570 | /* We can remove the LDX/LDY only when all bset/brclr instructions |
| 571 | of the relax group have been converted to use direct addressing |
| 572 | mode. */ |
| 573 | can_delete_ldx = 1; |
| 574 | while (offset < end_group) |
| 575 | { |
| 576 | unsigned isize; |
| 577 | unsigned new_value; |
| 578 | int bset_use_y; |
| 579 | |
| 580 | bset_use_y = 0; |
| 581 | start_offset = offset; |
| 582 | code = bfd_get_8 (abfd, contents + offset); |
| 583 | if (code == 0x18) |
| 584 | { |
| 585 | bset_use_y++; |
| 586 | offset++; |
| 587 | code = bfd_get_8 (abfd, contents + offset); |
| 588 | } |
| 589 | |
| 590 | /* Check the instruction and translate to use direct addressing mode. */ |
| 591 | switch (code) |
| 592 | { |
| 593 | /* bset */ |
| 594 | case 0x1C: |
| 595 | code = 0x14; |
| 596 | isize = 3; |
| 597 | break; |
| 598 | |
| 599 | /* brclr */ |
| 600 | case 0x1F: |
| 601 | code = 0x13; |
| 602 | isize = 4; |
| 603 | break; |
| 604 | |
| 605 | /* brset */ |
| 606 | case 0x1E: |
| 607 | code = 0x12; |
| 608 | isize = 4; |
| 609 | break; |
| 610 | |
| 611 | /* bclr */ |
| 612 | case 0x1D: |
| 613 | code = 0x15; |
| 614 | isize = 3; |
| 615 | break; |
| 616 | |
| 617 | /* This instruction is not recognized and we are not |
| 618 | at end of the relax group. Ignore and don't remove |
| 619 | the first LDX (we don't know what it is used for...). */ |
| 620 | default: |
| 621 | return; |
| 622 | } |
| 623 | new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1); |
| 624 | new_value += value; |
| 625 | if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy) |
| 626 | { |
| 627 | bfd_put_8 (abfd, code, contents + offset); |
| 628 | bfd_put_8 (abfd, new_value, contents + offset + 1); |
| 629 | if (start_offset != offset) |
| 630 | { |
| 631 | m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset, |
| 632 | offset - start_offset); |
| 633 | end_group--; |
| 634 | } |
| 635 | } |
| 636 | else |
| 637 | { |
| 638 | can_delete_ldx = 0; |
| 639 | } |
| 640 | offset = start_offset + isize; |
| 641 | } |
| 642 | if (can_delete_ldx) |
| 643 | { |
| 644 | /* Remove the move instruction (3 or 4 bytes win). */ |
| 645 | m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | /* This function handles relaxing for the 68HC11. |
| 650 | |
| 651 | |
| 652 | and somewhat more difficult to support. */ |
| 653 | |
| 654 | static bfd_boolean |
| 655 | m68hc11_elf_relax_section (bfd *abfd, asection *sec, |
| 656 | struct bfd_link_info *link_info, bfd_boolean *again) |
| 657 | { |
| 658 | Elf_Internal_Shdr *symtab_hdr; |
| 659 | Elf_Internal_Shdr *shndx_hdr; |
| 660 | Elf_Internal_Rela *internal_relocs; |
| 661 | Elf_Internal_Rela *free_relocs = NULL; |
| 662 | Elf_Internal_Rela *irel, *irelend; |
| 663 | bfd_byte *contents = NULL; |
| 664 | bfd_byte *free_contents = NULL; |
| 665 | Elf32_External_Sym *free_extsyms = NULL; |
| 666 | Elf_Internal_Rela *prev_insn_branch = NULL; |
| 667 | Elf_Internal_Rela *prev_insn_group = NULL; |
| 668 | unsigned insn_group_value = 0; |
| 669 | Elf_Internal_Sym *isymbuf = NULL; |
| 670 | |
| 671 | /* Assume nothing changes. */ |
| 672 | *again = FALSE; |
| 673 | |
| 674 | /* We don't have to do anything for a relocatable link, if |
| 675 | this section does not have relocs, or if this is not a |
| 676 | code section. */ |
| 677 | if (link_info->relocatable |
| 678 | || (sec->flags & SEC_RELOC) == 0 |
| 679 | || sec->reloc_count == 0 |
| 680 | || (sec->flags & SEC_CODE) == 0) |
| 681 | return TRUE; |
| 682 | |
| 683 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 684 | shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; |
| 685 | |
| 686 | /* Get a copy of the native relocations. */ |
| 687 | internal_relocs = (_bfd_elf_link_read_relocs |
| 688 | (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| 689 | link_info->keep_memory)); |
| 690 | if (internal_relocs == NULL) |
| 691 | goto error_return; |
| 692 | if (! link_info->keep_memory) |
| 693 | free_relocs = internal_relocs; |
| 694 | |
| 695 | /* Checking for branch relaxation relies on the relocations to |
| 696 | be sorted on 'r_offset'. This is not guaranteed so we must sort. */ |
| 697 | qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), |
| 698 | compare_reloc); |
| 699 | |
| 700 | /* Walk through them looking for relaxing opportunities. */ |
| 701 | irelend = internal_relocs + sec->reloc_count; |
| 702 | for (irel = internal_relocs; irel < irelend; irel++) |
| 703 | { |
| 704 | bfd_vma symval; |
| 705 | bfd_vma value; |
| 706 | Elf_Internal_Sym *isym; |
| 707 | asection *sym_sec; |
| 708 | int is_far = 0; |
| 709 | |
| 710 | /* If this isn't something that can be relaxed, then ignore |
| 711 | this reloc. */ |
| 712 | if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16 |
| 713 | && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP |
| 714 | && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP) |
| 715 | { |
| 716 | prev_insn_branch = 0; |
| 717 | prev_insn_group = 0; |
| 718 | continue; |
| 719 | } |
| 720 | |
| 721 | /* Get the section contents if we haven't done so already. */ |
| 722 | if (contents == NULL) |
| 723 | { |
| 724 | /* Get cached copy if it exists. */ |
| 725 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 726 | contents = elf_section_data (sec)->this_hdr.contents; |
| 727 | else |
| 728 | { |
| 729 | /* Go get them off disk. */ |
| 730 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 731 | goto error_return; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* Try to eliminate an unconditional 8 bit pc-relative branch |
| 736 | which immediately follows a conditional 8 bit pc-relative |
| 737 | branch around the unconditional branch. |
| 738 | |
| 739 | original: new: |
| 740 | bCC lab1 bCC' lab2 |
| 741 | bra lab2 |
| 742 | lab1: lab1: |
| 743 | |
| 744 | This happens when the bCC can't reach lab2 at assembly time, |
| 745 | but due to other relaxations it can reach at link time. */ |
| 746 | if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP) |
| 747 | { |
| 748 | Elf_Internal_Rela *nrel; |
| 749 | unsigned char code; |
| 750 | unsigned char roffset; |
| 751 | |
| 752 | prev_insn_branch = 0; |
| 753 | prev_insn_group = 0; |
| 754 | |
| 755 | /* Do nothing if this reloc is the last byte in the section. */ |
| 756 | if (irel->r_offset + 2 >= sec->size) |
| 757 | continue; |
| 758 | |
| 759 | /* See if the next instruction is an unconditional pc-relative |
| 760 | branch, more often than not this test will fail, so we |
| 761 | test it first to speed things up. */ |
| 762 | code = bfd_get_8 (abfd, contents + irel->r_offset + 2); |
| 763 | if (code != 0x7e) |
| 764 | continue; |
| 765 | |
| 766 | /* Also make sure the next relocation applies to the next |
| 767 | instruction and that it's a pc-relative 8 bit branch. */ |
| 768 | nrel = irel + 1; |
| 769 | if (nrel == irelend |
| 770 | || irel->r_offset + 3 != nrel->r_offset |
| 771 | || ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16) |
| 772 | continue; |
| 773 | |
| 774 | /* Make sure our destination immediately follows the |
| 775 | unconditional branch. */ |
| 776 | roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1); |
| 777 | if (roffset != 3) |
| 778 | continue; |
| 779 | |
| 780 | prev_insn_branch = irel; |
| 781 | prev_insn_group = 0; |
| 782 | continue; |
| 783 | } |
| 784 | |
| 785 | /* Read this BFD's symbols if we haven't done so already. */ |
| 786 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 787 | { |
| 788 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 789 | if (isymbuf == NULL) |
| 790 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 791 | symtab_hdr->sh_info, 0, |
| 792 | NULL, NULL, NULL); |
| 793 | if (isymbuf == NULL) |
| 794 | goto error_return; |
| 795 | } |
| 796 | |
| 797 | /* Get the value of the symbol referred to by the reloc. */ |
| 798 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 799 | { |
| 800 | /* A local symbol. */ |
| 801 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 802 | is_far = isym->st_other & STO_M68HC12_FAR; |
| 803 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 804 | symval = (isym->st_value |
| 805 | + sym_sec->output_section->vma |
| 806 | + sym_sec->output_offset); |
| 807 | } |
| 808 | else |
| 809 | { |
| 810 | unsigned long indx; |
| 811 | struct elf_link_hash_entry *h; |
| 812 | |
| 813 | /* An external symbol. */ |
| 814 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 815 | h = elf_sym_hashes (abfd)[indx]; |
| 816 | BFD_ASSERT (h != NULL); |
| 817 | if (h->root.type != bfd_link_hash_defined |
| 818 | && h->root.type != bfd_link_hash_defweak) |
| 819 | { |
| 820 | /* This appears to be a reference to an undefined |
| 821 | symbol. Just ignore it--it will be caught by the |
| 822 | regular reloc processing. */ |
| 823 | prev_insn_branch = 0; |
| 824 | prev_insn_group = 0; |
| 825 | continue; |
| 826 | } |
| 827 | |
| 828 | is_far = h->other & STO_M68HC12_FAR; |
| 829 | isym = 0; |
| 830 | sym_sec = h->root.u.def.section; |
| 831 | symval = (h->root.u.def.value |
| 832 | + sym_sec->output_section->vma |
| 833 | + sym_sec->output_offset); |
| 834 | } |
| 835 | |
| 836 | if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP) |
| 837 | { |
| 838 | prev_insn_branch = 0; |
| 839 | prev_insn_group = 0; |
| 840 | |
| 841 | /* Do nothing if this reloc is the last byte in the section. */ |
| 842 | if (irel->r_offset == sec->size) |
| 843 | continue; |
| 844 | |
| 845 | prev_insn_group = irel; |
| 846 | insn_group_value = isym->st_value; |
| 847 | continue; |
| 848 | } |
| 849 | |
| 850 | /* When we relax some bytes, the size of our section changes. |
| 851 | This affects the layout of next input sections that go in our |
| 852 | output section. When the symbol is part of another section that |
| 853 | will go in the same output section as the current one, it's |
| 854 | final address may now be incorrect (too far). We must let the |
| 855 | linker re-compute all section offsets before processing this |
| 856 | reloc. Code example: |
| 857 | |
| 858 | Initial Final |
| 859 | .sect .text section size = 6 section size = 4 |
| 860 | jmp foo |
| 861 | jmp bar |
| 862 | .sect .text.foo_bar output_offset = 6 output_offset = 4 |
| 863 | foo: rts |
| 864 | bar: rts |
| 865 | |
| 866 | If we process the reloc now, the jmp bar is replaced by a |
| 867 | relative branch to the initial bar address (output_offset 6). */ |
| 868 | if (*again && sym_sec != sec |
| 869 | && sym_sec->output_section == sec->output_section) |
| 870 | { |
| 871 | prev_insn_group = 0; |
| 872 | prev_insn_branch = 0; |
| 873 | continue; |
| 874 | } |
| 875 | |
| 876 | value = symval; |
| 877 | /* Try to turn a far branch to a near branch. */ |
| 878 | if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16 |
| 879 | && prev_insn_branch) |
| 880 | { |
| 881 | bfd_vma offset; |
| 882 | unsigned char code; |
| 883 | |
| 884 | offset = value - (prev_insn_branch->r_offset |
| 885 | + sec->output_section->vma |
| 886 | + sec->output_offset + 2); |
| 887 | |
| 888 | /* If the offset is still out of -128..+127 range, |
| 889 | leave that far branch unchanged. */ |
| 890 | if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80) |
| 891 | { |
| 892 | prev_insn_branch = 0; |
| 893 | continue; |
| 894 | } |
| 895 | |
| 896 | /* Shrink the branch. */ |
| 897 | code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset); |
| 898 | if (code == 0x7e) |
| 899 | { |
| 900 | code = 0x20; |
| 901 | bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset); |
| 902 | bfd_put_8 (abfd, 0xff, |
| 903 | contents + prev_insn_branch->r_offset + 1); |
| 904 | irel->r_offset = prev_insn_branch->r_offset + 1; |
| 905 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 906 | R_M68HC11_PCREL_8); |
| 907 | m68hc11_elf_relax_delete_bytes (abfd, sec, |
| 908 | irel->r_offset + 1, 1); |
| 909 | } |
| 910 | else |
| 911 | { |
| 912 | code ^= 0x1; |
| 913 | bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset); |
| 914 | bfd_put_8 (abfd, 0xff, |
| 915 | contents + prev_insn_branch->r_offset + 1); |
| 916 | irel->r_offset = prev_insn_branch->r_offset + 1; |
| 917 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 918 | R_M68HC11_PCREL_8); |
| 919 | m68hc11_elf_relax_delete_bytes (abfd, sec, |
| 920 | irel->r_offset + 1, 3); |
| 921 | } |
| 922 | prev_insn_branch = 0; |
| 923 | *again = TRUE; |
| 924 | } |
| 925 | |
| 926 | /* Try to turn a 16 bit address into a 8 bit page0 address. */ |
| 927 | else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16 |
| 928 | && (value & 0xff00) == 0) |
| 929 | { |
| 930 | unsigned char code; |
| 931 | unsigned short offset; |
| 932 | struct m68hc11_direct_relax *rinfo; |
| 933 | |
| 934 | prev_insn_branch = 0; |
| 935 | offset = bfd_get_16 (abfd, contents + irel->r_offset); |
| 936 | offset += value; |
| 937 | if ((offset & 0xff00) != 0) |
| 938 | { |
| 939 | prev_insn_group = 0; |
| 940 | continue; |
| 941 | } |
| 942 | |
| 943 | if (prev_insn_group) |
| 944 | { |
| 945 | unsigned long old_sec_size = sec->size; |
| 946 | |
| 947 | /* Note that we've changed the relocation contents, etc. */ |
| 948 | elf_section_data (sec)->relocs = internal_relocs; |
| 949 | free_relocs = NULL; |
| 950 | |
| 951 | elf_section_data (sec)->this_hdr.contents = contents; |
| 952 | free_contents = NULL; |
| 953 | |
| 954 | symtab_hdr->contents = (bfd_byte *) isymbuf; |
| 955 | free_extsyms = NULL; |
| 956 | |
| 957 | m68hc11_relax_group (abfd, sec, contents, offset, |
| 958 | prev_insn_group->r_offset, |
| 959 | insn_group_value); |
| 960 | irel = prev_insn_group; |
| 961 | prev_insn_group = 0; |
| 962 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 963 | R_M68HC11_NONE); |
| 964 | if (sec->size != old_sec_size) |
| 965 | *again = TRUE; |
| 966 | continue; |
| 967 | } |
| 968 | |
| 969 | /* Get the opcode. */ |
| 970 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 971 | rinfo = find_relaxable_insn (code); |
| 972 | if (rinfo == 0) |
| 973 | { |
| 974 | prev_insn_group = 0; |
| 975 | continue; |
| 976 | } |
| 977 | |
| 978 | /* Note that we've changed the relocation contents, etc. */ |
| 979 | elf_section_data (sec)->relocs = internal_relocs; |
| 980 | free_relocs = NULL; |
| 981 | |
| 982 | elf_section_data (sec)->this_hdr.contents = contents; |
| 983 | free_contents = NULL; |
| 984 | |
| 985 | symtab_hdr->contents = (bfd_byte *) isymbuf; |
| 986 | free_extsyms = NULL; |
| 987 | |
| 988 | /* Fix the opcode. */ |
| 989 | /* printf ("A relaxable case : 0x%02x (%s)\n", |
| 990 | code, rinfo->name); */ |
| 991 | bfd_put_8 (abfd, rinfo->direct_code, |
| 992 | contents + irel->r_offset - 1); |
| 993 | |
| 994 | /* Delete one byte of data (upper byte of address). */ |
| 995 | m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1); |
| 996 | |
| 997 | /* Fix the relocation's type. */ |
| 998 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 999 | R_M68HC11_8); |
| 1000 | |
| 1001 | /* That will change things, so, we should relax again. */ |
| 1002 | *again = TRUE; |
| 1003 | } |
| 1004 | else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16 && !is_far) |
| 1005 | { |
| 1006 | unsigned char code; |
| 1007 | bfd_vma offset; |
| 1008 | |
| 1009 | prev_insn_branch = 0; |
| 1010 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1011 | if (code == 0x7e || code == 0xbd) |
| 1012 | { |
| 1013 | offset = value - (irel->r_offset |
| 1014 | + sec->output_section->vma |
| 1015 | + sec->output_offset + 1); |
| 1016 | offset += bfd_get_16 (abfd, contents + irel->r_offset); |
| 1017 | |
| 1018 | /* If the offset is still out of -128..+127 range, |
| 1019 | leave that far branch unchanged. */ |
| 1020 | if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80) |
| 1021 | { |
| 1022 | |
| 1023 | /* Note that we've changed the relocation contents, etc. */ |
| 1024 | elf_section_data (sec)->relocs = internal_relocs; |
| 1025 | free_relocs = NULL; |
| 1026 | |
| 1027 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1028 | free_contents = NULL; |
| 1029 | |
| 1030 | symtab_hdr->contents = (bfd_byte *) isymbuf; |
| 1031 | free_extsyms = NULL; |
| 1032 | |
| 1033 | /* Shrink the branch. */ |
| 1034 | code = (code == 0x7e) ? 0x20 : 0x8d; |
| 1035 | bfd_put_8 (abfd, code, |
| 1036 | contents + irel->r_offset - 1); |
| 1037 | bfd_put_8 (abfd, 0xff, |
| 1038 | contents + irel->r_offset); |
| 1039 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1040 | R_M68HC11_PCREL_8); |
| 1041 | m68hc11_elf_relax_delete_bytes (abfd, sec, |
| 1042 | irel->r_offset + 1, 1); |
| 1043 | /* That will change things, so, we should relax again. */ |
| 1044 | *again = TRUE; |
| 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | prev_insn_branch = 0; |
| 1049 | prev_insn_group = 0; |
| 1050 | } |
| 1051 | |
| 1052 | if (free_relocs != NULL) |
| 1053 | { |
| 1054 | free (free_relocs); |
| 1055 | free_relocs = NULL; |
| 1056 | } |
| 1057 | |
| 1058 | if (free_contents != NULL) |
| 1059 | { |
| 1060 | if (! link_info->keep_memory) |
| 1061 | free (free_contents); |
| 1062 | else |
| 1063 | { |
| 1064 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1065 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1066 | } |
| 1067 | free_contents = NULL; |
| 1068 | } |
| 1069 | |
| 1070 | if (free_extsyms != NULL) |
| 1071 | { |
| 1072 | if (! link_info->keep_memory) |
| 1073 | free (free_extsyms); |
| 1074 | else |
| 1075 | { |
| 1076 | /* Cache the symbols for elf_link_input_bfd. */ |
| 1077 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1078 | } |
| 1079 | free_extsyms = NULL; |
| 1080 | } |
| 1081 | |
| 1082 | return TRUE; |
| 1083 | |
| 1084 | error_return: |
| 1085 | if (free_relocs != NULL) |
| 1086 | free (free_relocs); |
| 1087 | if (free_contents != NULL) |
| 1088 | free (free_contents); |
| 1089 | if (free_extsyms != NULL) |
| 1090 | free (free_extsyms); |
| 1091 | return FALSE; |
| 1092 | } |
| 1093 | |
| 1094 | /* Delete some bytes from a section while relaxing. */ |
| 1095 | |
| 1096 | static void |
| 1097 | m68hc11_elf_relax_delete_bytes (bfd *abfd, asection *sec, |
| 1098 | bfd_vma addr, int count) |
| 1099 | { |
| 1100 | Elf_Internal_Shdr *symtab_hdr; |
| 1101 | unsigned int sec_shndx; |
| 1102 | bfd_byte *contents; |
| 1103 | Elf_Internal_Rela *irel, *irelend; |
| 1104 | bfd_vma toaddr; |
| 1105 | Elf_Internal_Sym *isymbuf, *isym, *isymend; |
| 1106 | struct elf_link_hash_entry **sym_hashes; |
| 1107 | struct elf_link_hash_entry **end_hashes; |
| 1108 | unsigned int symcount; |
| 1109 | |
| 1110 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1111 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1112 | |
| 1113 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1114 | |
| 1115 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1116 | |
| 1117 | toaddr = sec->size; |
| 1118 | |
| 1119 | irel = elf_section_data (sec)->relocs; |
| 1120 | irelend = irel + sec->reloc_count; |
| 1121 | |
| 1122 | /* Actually delete the bytes. */ |
| 1123 | memmove (contents + addr, contents + addr + count, |
| 1124 | (size_t) (toaddr - addr - count)); |
| 1125 | |
| 1126 | sec->size -= count; |
| 1127 | |
| 1128 | /* Adjust all the relocs. */ |
| 1129 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 1130 | { |
| 1131 | unsigned char code; |
| 1132 | unsigned char offset; |
| 1133 | unsigned short raddr; |
| 1134 | unsigned long old_offset; |
| 1135 | int branch_pos; |
| 1136 | |
| 1137 | old_offset = irel->r_offset; |
| 1138 | |
| 1139 | /* See if this reloc was for the bytes we have deleted, in which |
| 1140 | case we no longer care about it. Don't delete relocs which |
| 1141 | represent addresses, though. */ |
| 1142 | if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP |
| 1143 | && irel->r_offset >= addr && irel->r_offset < addr + count) |
| 1144 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1145 | R_M68HC11_NONE); |
| 1146 | |
| 1147 | if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE) |
| 1148 | continue; |
| 1149 | |
| 1150 | /* Get the new reloc address. */ |
| 1151 | if ((irel->r_offset > addr |
| 1152 | && irel->r_offset < toaddr)) |
| 1153 | irel->r_offset -= count; |
| 1154 | |
| 1155 | /* If this is a PC relative reloc, see if the range it covers |
| 1156 | includes the bytes we have deleted. */ |
| 1157 | switch (ELF32_R_TYPE (irel->r_info)) |
| 1158 | { |
| 1159 | default: |
| 1160 | break; |
| 1161 | |
| 1162 | case R_M68HC11_RL_JUMP: |
| 1163 | code = bfd_get_8 (abfd, contents + irel->r_offset); |
| 1164 | switch (code) |
| 1165 | { |
| 1166 | /* jsr and jmp instruction are also marked with RL_JUMP |
| 1167 | relocs but no adjustment must be made. */ |
| 1168 | case 0x7e: |
| 1169 | case 0x9d: |
| 1170 | case 0xbd: |
| 1171 | continue; |
| 1172 | |
| 1173 | case 0x12: |
| 1174 | case 0x13: |
| 1175 | branch_pos = 3; |
| 1176 | raddr = 4; |
| 1177 | |
| 1178 | /* Special case when we translate a brclr N,y into brclr *<addr> |
| 1179 | In this case, the 0x18 page2 prefix is removed. |
| 1180 | The reloc offset is not modified but the instruction |
| 1181 | size is reduced by 1. */ |
| 1182 | if (old_offset == addr) |
| 1183 | raddr++; |
| 1184 | break; |
| 1185 | |
| 1186 | case 0x1e: |
| 1187 | case 0x1f: |
| 1188 | branch_pos = 3; |
| 1189 | raddr = 4; |
| 1190 | break; |
| 1191 | |
| 1192 | case 0x18: |
| 1193 | branch_pos = 4; |
| 1194 | raddr = 5; |
| 1195 | break; |
| 1196 | |
| 1197 | default: |
| 1198 | branch_pos = 1; |
| 1199 | raddr = 2; |
| 1200 | break; |
| 1201 | } |
| 1202 | offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos); |
| 1203 | raddr += old_offset; |
| 1204 | raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0)); |
| 1205 | if (irel->r_offset < addr && raddr > addr) |
| 1206 | { |
| 1207 | offset -= count; |
| 1208 | bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos); |
| 1209 | } |
| 1210 | else if (irel->r_offset >= addr && raddr <= addr) |
| 1211 | { |
| 1212 | offset += count; |
| 1213 | bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos); |
| 1214 | } |
| 1215 | else |
| 1216 | { |
| 1217 | /*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr, |
| 1218 | irel->r_offset, addr);*/ |
| 1219 | } |
| 1220 | |
| 1221 | break; |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | /* Adjust the local symbols defined in this section. */ |
| 1226 | isymend = isymbuf + symtab_hdr->sh_info; |
| 1227 | for (isym = isymbuf; isym < isymend; isym++) |
| 1228 | { |
| 1229 | if (isym->st_shndx == sec_shndx |
| 1230 | && isym->st_value > addr |
| 1231 | && isym->st_value <= toaddr) |
| 1232 | isym->st_value -= count; |
| 1233 | } |
| 1234 | |
| 1235 | /* Now adjust the global symbols defined in this section. */ |
| 1236 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1237 | - symtab_hdr->sh_info); |
| 1238 | sym_hashes = elf_sym_hashes (abfd); |
| 1239 | end_hashes = sym_hashes + symcount; |
| 1240 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1241 | { |
| 1242 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1243 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1244 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1245 | && sym_hash->root.u.def.section == sec |
| 1246 | && sym_hash->root.u.def.value > addr |
| 1247 | && sym_hash->root.u.def.value <= toaddr) |
| 1248 | { |
| 1249 | sym_hash->root.u.def.value -= count; |
| 1250 | } |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | /* Specific sections: |
| 1255 | - The .page0 is a data section that is mapped in [0x0000..0x00FF]. |
| 1256 | Page0 accesses are faster on the M68HC11. Soft registers used by GCC-m6811 |
| 1257 | are located in .page0. |
| 1258 | - The .vectors is the section that represents the interrupt |
| 1259 | vectors. */ |
| 1260 | static struct bfd_elf_special_section const elf32_m68hc11_special_sections[]= |
| 1261 | { |
| 1262 | { ".eeprom", 7, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| 1263 | { ".softregs", 9, 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, |
| 1264 | { ".page0", 6, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| 1265 | { ".vectors", 8, 0, SHT_PROGBITS, SHF_ALLOC }, |
| 1266 | { NULL, 0, 0, 0, 0 } |
| 1267 | }; |
| 1268 | \f |
| 1269 | #define ELF_ARCH bfd_arch_m68hc11 |
| 1270 | #define ELF_MACHINE_CODE EM_68HC11 |
| 1271 | #define ELF_MAXPAGESIZE 0x1000 |
| 1272 | |
| 1273 | #define TARGET_BIG_SYM bfd_elf32_m68hc11_vec |
| 1274 | #define TARGET_BIG_NAME "elf32-m68hc11" |
| 1275 | |
| 1276 | #define elf_info_to_howto 0 |
| 1277 | #define elf_info_to_howto_rel m68hc11_info_to_howto_rel |
| 1278 | #define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section |
| 1279 | #define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook |
| 1280 | #define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook |
| 1281 | #define elf_backend_check_relocs elf32_m68hc11_check_relocs |
| 1282 | #define elf_backend_relocate_section elf32_m68hc11_relocate_section |
| 1283 | #define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook |
| 1284 | #define elf_backend_object_p 0 |
| 1285 | #define elf_backend_final_write_processing 0 |
| 1286 | #define elf_backend_can_gc_sections 1 |
| 1287 | #define elf_backend_special_sections elf32_m68hc11_special_sections |
| 1288 | |
| 1289 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 1290 | m68hc11_elf_bfd_link_hash_table_create |
| 1291 | #define bfd_elf32_bfd_link_hash_table_free \ |
| 1292 | m68hc11_elf_bfd_link_hash_table_free |
| 1293 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 1294 | _bfd_m68hc11_elf_merge_private_bfd_data |
| 1295 | #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags |
| 1296 | #define bfd_elf32_bfd_print_private_bfd_data \ |
| 1297 | _bfd_m68hc11_elf_print_private_bfd_data |
| 1298 | |
| 1299 | #include "elf32-target.h" |